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Analog Devices Inc. LTC4156IUFD#TRPBF
- Part No.:
- LTC4156IUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4156IUFD#TRPBF.pdf
- Description:
- IC BAT CHG IRON PHOSPHT 1C 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,841
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Product details
Overview
LTC4156IUFD#TRPBF from Analog Devices (formerly Linear Technology) is a dual-input I²C-controlled power manager and 3.5A LiFePO₄ battery charger in a 28-lead 4mm × 5mm QFN package. It delivers PowerPath™ instant-on operation, seamless priority-based input multiplexing between USB and wall adapter sources, and USB On-The-Go (OTG) power delivery - enabling system load operation even with deeply discharged batteries.
For engineers reviewing the LTC4156IUFD#TRPBF datasheet, LTC4156IUFD#TRPBF pinout, LTC4156IUFD#TRPBF application, or LTC4156IUFD#TRPBF equivalent, key selection criteria include its I²C-programmable float voltage (3.45V/3.55V/3.6V/3.8V), configurable 100mA–3A input current limits, integrated NTC thermistor ADC for JEITA-compliant charging, and dual-input overvoltage protection with active gate drive outputs (USBGT/WALLGT).
Technical Context
The LTC4156IUFD#TRPBF integrates a high-efficiency step-down switching battery charger (2.25MHz fixed-frequency PWM), dual-input priority multiplexer with independent overvoltage protection circuitry, and bidirectional PowerPath™ control logic. Its I²C interface enables real-time configuration of charge current (up to 3.5A), float voltage, safety timer, recharge threshold, and OTG output current limit.
It features dedicated analog sensing paths: CLPROG1/CLPROG2 for precise VBUS current limiting, CHGSNS/BATSNS for battery charge regulation, and NTC/NTCBIAS for temperature-dependent charge algorithms. The device supports USB suspend mode (2.5mA quiescent), ship-and-store mode (<0.6µA), and automatic transition between battery-powered and input-sourced VOUT regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.35V to 5.5V on VBUS; supports dual 5V inputs with priority multiplexing |
| Max Charge Current | 3.5A - programmable via I²C and PROG resistor; optimized for LiFePO₄ chemistry |
| Float Voltage Options | 3.45V / 3.55V / 3.60V / 3.80V - selectable via I²C; avoids overcharge in LiFePO₄ cells |
| Switching Frequency | 2.25MHz typical - enables compact 1µH inductor and low-profile layout |
| VOUT Regulation | 4.35V to 4.5V - maintains stable system rail during battery charging or discharge |
| I²C Address | 0x11 (0001001b) - standard 7-bit address with R/W bit; supports SMBus compatibility |
| Operating Temp Range | –40°C to +125°C - specified and guaranteed for industrial/medical applications |
| Package | 28-lead 4mm × 5mm × 0.75mm QFN - exposed pad for thermal dissipation; RoHS-compliant |
Pinout & Package
Package: 28-lead plastic QFN (UFD), 4mm × 5mm, 0.75mm height, exposed thermal pad (Pin 29 = GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBUS (Pins 20,21,22) | Main USB input supply | Accepts up to 5.5V; feeds internal regulator and switching charger; protected by OVP |
| WALLSNS (Pin 7) | High-priority input sense | Detects wall adapter presence; triggers WALLGT gate drive; enables priority override of USB |
| USBSNS (Pin 8) | Low-priority input sense | Detects USB port presence only when WALLSNS inactive; enables USBGT gate drive |
| USBGT / WALLGT (Pins 9,17) | OVP gate drive outputs | Drive external N-MOSFETs; pulled low on overvoltage (>6.0V) to disconnect input safely |
| CHGSNS / BATSNS (Pins 12,15) | Battery charge & voltage sense | Direct Kelvin connection to battery terminals; enables accurate current regulation and float control |
| NTC / NTCBIAS (Pins 14,18) | Thermistor interface | Provides ratiometric ADC input for JEITA-compliant temperature-aware charging profiles |
| SDA / SCL (Pins 1,24) | I²C serial interface | Configures all operating parameters and reads status registers; DVCC-referenced logic levels |
| IRQ (Pin 3) | Interrupt request output | Open-drain signal indicating fault conditions (OVP, thermal, bad battery, timer expiry) |
Key Features
| Feature | Design Value |
|---|---|
| PowerPath™ Instant-On | Maintains regulated VOUT ≥3.10V even with battery <3.0V - eliminates system brownout during boot |
| USB On-The-Go (OTG) | Delivers up to 1.4A at 4.75–5.25V from battery to VBUS without external components |
| LiFePO₄-Optimized Charging | Four factory-trimmed float voltages (3.45V–3.80V) and JEITA-compatible NTC monitoring |
| Dual-Input Priority Multiplexing | Hardware-selectable priority (WALLSNS > USBSNS); programmable via I²C for dynamic reordering |
| Integrated Overvoltage Protection | Active gate drivers (USBGT/WALLGT) disable external MOSFETs within 7.2ms if input exceeds 6.0V |
| Ultra-Low Quiescent Current | ≤0.6µA in ship-and-store mode (DVCC = 0V); ≤500µA in USB suspend mode |
Applications
| Portable Medical Devices | Portable Industrial Handhelds |
|---|---|
|
Use Scenario: Battery-powered ECG monitor requiring continuous operation during charging and seamless failover to backup power. IC Role / Device Role / Timing Role: Dual-input power manager and LiFePO₄ charger ensuring uninterrupted VOUT supply while regulating charge based on NTC temperature feedback. Use Value: Prevents clinical data loss during hot-swap of USB or wall adapter; extends runtime via 3.5A fast charge and low-quiescent ship mode. |
Use Scenario: Ruggedized barcode scanner used in warehouse environments with frequent USB docking and AC adapter use. IC Role / Device Role / Timing Role: Priority multiplexer that defaults to wall adapter but instantly switches to USB when unplugged - maintaining system uptime. Use Value: Eliminates manual power source selection; OVP protects against damaged chargers; I²C enables firmware-controlled charge profiles. |
| Backup Power Systems | Field-Deployable Test Equipment |
|
Use Scenario: Remote sensor node with LiFePO₄ battery and solar/USB hybrid charging, requiring long-term storage stability. IC Role / Device Role / Timing Role: Charger and power path controller managing energy flow from intermittent sources while enforcing JEITA temperature limits. Use Value: Ship-and-store mode draws <0.6µA to preserve battery for >10 years; NTC ADC prevents thermal runaway during field charging. |
Use Scenario: Portable oscilloscope powered by LiFePO₄ battery, needing USB OTG capability to power connected probes or accessories. IC Role / Device Role / Timing Role: Bidirectional power manager delivering regulated 5V/1.4A from battery to USB port without external boost converter. Use Value: Reduces BOM count and PCB area; eliminates need for discrete OTG switch and LDO; supports plug-and-play accessory detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4162IUFD#TRPBF | Supports Li-ion/LiPo (4.2V float), not LiFePO₄; includes integrated buck-boost for wide-input VOUT; no USBGT/WALLGT outputs | Better suited for single-cell Li-ion systems requiring 2.7–5.5V VOUT; lacks dedicated LiFePO₄ voltage options and dual-OVP gate drives | Select LTC4162IUFD#TRPBF only if migrating from LiFePO₄ to Li-ion and requiring buck-boost VOUT regulation. |
| BQ24650RGER | Standalone 3.5A LiFePO₄ charger (no PowerPath, no dual-input mux, no I²C, no OTG); analog-programmed via resistors | Lower cost for fixed-function charging-only designs; requires external ideal diode or OR-ing controller for dual-input support | Choose BQ24650RGER when system already implements discrete power path logic and I²C configurability is unnecessary. |
Compared with LTC4156IUFD#TRPBF, LTC4162IUFD#TRPBF trades LiFePO₄ optimization and dual-OVP gate drivers for wider VOUT flexibility and Li-ion support, while BQ24650RGER offers lower complexity and cost at the expense of configurability, power path integration, and USB OTG capability.
Availability
LTC4156IUFD#TRPBF is available at Aetrix Electronics and suitable for portable medical devices, industrial handhelds, and backup power systems requiring stable component supply, guaranteed industrial temperature range (–40°C to +125°C), and long-term lifecycle continuity.
Supply support for LTC4156IUFD#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC4156 belongs to Linear's Power Management family, designed specifically for high-density, multi-source battery-powered systems requiring intelligent charge control, seamless input prioritization, and USB-compliant power delivery.
FAQ
What is the maximum supported battery charge current for the LTC4156IUFD#TRPBF?
The LTC4156IUFD#TRPBF supports up to 3.5A regulated charge current, programmable via I²C command or PROG pin resistor (RPROG = 340Ω yields 3.44–3.70A depending on VFLOAT setting). This value is validated across the full –40°C to +125°C operating range and optimized for lithium iron phosphate (LiFePO₄) cell chemistry.
Does the LTC4156IUFD#TRPBF support USB On-The-Go (OTG) functionality?
Yes, the LTC4156IUFD#TRPBF provides native USB OTG power delivery: it sources up to 1.4A at 4.75–5.25V from the battery to the VBUS pin without external components. This is enabled via internal step-up regulation and controlled through I²C register settings, with automatic current limiting and thermal protection.
How does the LTC4156IUFD#TRPBF handle overvoltage protection on its input pins?
The LTC4156IUFD#TRPBF implements hardware-based overvoltage protection on both WALLSNS and USBSNS inputs, triggering at 6.0V (typical). When exceeded, it pulls USBGT or WALLGT low within 7.2ms to disable external N-MOSFET pass transistors - protecting downstream circuitry without relying on I²C intervention or software response.
Can the LTC4156IUFD#TRPBF be used with lithium-ion (Li-ion) batteries?
The LTC4156IUFD#TRPBF is specifically optimized for LiFePO₄ batteries, with float voltages ranging from 3.45V to 3.80V. While it may physically charge Li-ion cells, its default termination thresholds, recharge voltages, and JEITA profile assumptions are mismatched - using it with Li-ion risks undercharging or premature termination. For Li-ion, consider LTC4162IUFD#TRPBF instead.
What is the purpose of the CLPROG1 and CLPROG2 pins on the LTC4156IUFD#TRPBF?
CLPROG1 and CLPROG2 are independent VBUS current limit programming inputs. CLPROG2 supports USB-compliant modes (100mA/500mA/900mA), while CLPROG1 allows non-USB wall adapter current limits (up to 3A). Both use a 1.2V servo reference and external resistor to set precise input current caps - enabling flexible, application-specific power budgeting without firmware changes.
LTC4156IUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Iron Phosphate
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Voltage
- Charge Current - Max:
- 3.7A
- Battery Pack Voltage:
- 3.8V
- Voltage - Supply (Max):
- 5.5V
- Interface:
- I2C, USB
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC4156IUFD#TRPBF FAQ
1.How can I place an order for LTC4156IUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4156IUFD#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC4156IUFD#TRPBF reliable?
The price and inventory of LTC4156IUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4156IUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4156IUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4156IUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4156IUFD#TRPBF?
LTC4156IUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4156IUFD#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC4156IUFD#TRPBF?
For technical support, including LTC4156IUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4156IUFD#TRPBF requirements.
6.How does Aetrix verify that LTC4156IUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4156IUFD#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC4156IUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4156IUFD#TRPBF?
All LTC4156IUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4156IUFD#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC4156IUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC4156IUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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